AlexsMom, I just want to make sure that I understand something you mentioned about the grade acceleration.
The way you explained it sounds like the requirement is to show 90% proficiency in all 3rd grade subjects in order to accelerate to 3rd grade. That seems pretty counter-intuitive to me, but I do understand that is exactly how some public school systems work. Wouldn't she need to show 90% mastery of all the 2nd grade subjects to accelerate to 3rd grade?
To be honest if your DD (or any other child) could demonstrate 90% mastery of all 3rd grade subjects, why would she need to sit through 3rd grade at all?
My other comment would be - even if the proficiency standard is 90% mastery for 2nd grade material, for acceleration to 3rd grade, what is the normal promotion/progression standard for 2nd to 3rd grade - I'm willing to bet that it's not 90% mastery.
From what you described, I'm not sure that even if you get your first choice (acceleration to 3rd grade) that it will help your situation much. Your DD is not likely to be 'in the middle' of a 3rd grade class if she meets these mastery requirements to be accelerated.